| 81. | trace to its source |
| 追根寻源
|
| 82. | the source of all evils |
| 万恶之源
|
| 83. | a source of funds |
| 资金来源
|
| 84. | credit the source of an article |
| 注明文章的出处
|
| 85. | discover the source of the Nile |
| 发现尼罗河的源头
|
| 86. | find the source of the engine trouble |
| 找到发动机故障的原因
|
| 87. | form a source for future trouble |
| 成为未来烦恼的根源
|
| 88. | locate the source of the contamination |
| 找出污染源
|
| 89. | name the source of information |
| 说出情报的来源
|
| 90. | take its source at |
| 发源于…；出自…；起于…
|